About SpinThatWheel

SpinThatWheel is a collection of spinning decision wheels that run entirely in your browser, published by Sumvia, the team behind the Sumvia.net calculator network. It exists because the popular wheel sites get the fun part right and the honest part wrong: they rarely say how the winner is actually chosen. This site leads with it — the pick is made by cryptographic randomness before the wheel starts turning, and the methodology page explains the whole mechanism.

Thirteen wheels, one engine

The flagship is the custom wheel on the landing page — type any list up to 100 entries and spin. Around it sit twelve presets in three groups: quick decisions (Yes or No, Coin Flip, Go or Stay, Accept or Decline), numbers and letters (Number, Letter, Dice), and themed lists (US States, Zodiac, Food, Questions, Colors). Every preset is a starting list, not a cage: each one is editable, shareable by link, and spins through the same tested engine.

Who spins these

Teachers cold-calling fairly and drilling states or letters without favorites. Meeting hosts who need an icebreaker no one can accuse them of aiming. Households deadlocked on dinner or on leaving the house. Game tables missing a die. Anyone running a casual giveaway where "my cousin spun it" needs to be beyond suspicion. The common thread: a pick that has to be visibly fair to people who are watching.

Honesty about randomness

Every pick on this site is drawn with rejection sampling over crypto.getRandomValues — the browser's cryptographic randomness — so each entry is exactly equally likely, with no modulo bias and no influence from the animation, the wheel's resting position, or previous spins. The spin you watch is an announcement, not a draw: the winner already exists when the wheel starts moving. We consider saying this plainly a feature no honest randomizer should omit.

Tested like arithmetic, not like a toy

The wheel engine — entry parsing, segment geometry, the uniform pick, eliminator mode, share links — is a set of small typed functions covered by an automated test suite, including exhaustive checks that every random byte maps to an outcome with equal frequency. Factual preset lists are pinned by tests too: the state wheel has exactly 50 states because a test fails otherwise. Worked figures in page copy (segment angles, probabilities) are computed at build time by the same engine, so the prose cannot drift from the code.

Browser-native, no accounts

Your lists are processed on your device and saved, at most, in your own browser's storage. Nothing you type is transmitted, logged, or stored by us — the only way a list leaves your browser is inside a share link you deliberately copy and send. There is no registration, and a loaded page keeps working on a flaky connection. This is a deliberate design constraint of every Sumvia site.

What this site is not

SpinThatWheel is for decisions, games, classrooms, and casual giveaways. It is not a gambling device, not a certified raffle system, and not a substitute for professional judgment — a uniform random draw is exactly the wrong tool for decisions that deserve weighing. Where a page's wheel touches a serious use, the page says so directly.

Get in touch

Found a problem, or want to suggest a preset wheel? See the contact page — reports of suspected fairness or display issues are especially welcome and are treated seriously.